Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What is the most likely effect of an excess amount of lube oil in the crankcase of an air conditioning refrigeration compressor?

The oil will create a vacuum in the system
The oil carried over will be removed by an oil separator
The compressor will overheat immediately
The compressor will stop functioning completely

The correct answer is: The oil carried over will be removed by an oil separator

The presence of an excess amount of lube oil in the crankcase of an air conditioning refrigeration compressor can lead to oil carryover into the refrigerant system. In well-designed systems, there are often components such as oil separators that are specifically intended to remove any excess oil that might have made its way into the refrigerant circuit. These separators work by allowing the refrigerant to pass through while capturing and returning the excess oil back to the crankcase. This is important because while some oil is necessary for lubrication, too much can cause issues such as reduced heat transfer efficiency or even compressor damage. The ability of the oil separator to manage this excess oil helps maintain the integrity of the system, thereby ensuring smooth compressor operation. The effectiveness of the oil separator is crucial in preventing the complications that arise from oil contamination in the refrigeration cycle.